I just signup with a Bitcoin tax software. It was very easy. Just upload exported files from each exchange. They have a step-by-step guide for every exchange they support. You select the tax plan you wish and it does all calculations for you. I did a lot of trading last year and I was very afraid of all accounting work in front of me. However, I found this software and everything was finished in less than 30 min. It is free up to 10 or 100 trades per year. Up to 1000 trades costs $29 per year and the premium costs $99. Worth every cent!